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2021 | 38 | 139-157
Article title

An assessment of water quality temporal variation in Sri Jayawardenapura Kotte canal, Sri Lanka

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Abstracts
EN
Assessment of temporal variation of the water quality is an essential aspect of evaluating temporary changes in a water body caused by natural or artificial contributions. The study aims to assess the water quality temporal variation and the water quality index over the year from 2010 to 2019. Water sampling was carried out near the bridge of the Kotte canal. Water quality parameters such as pH, electrical conductivity (EC), temperature, dissolved oxygen (DO), ammonia, nitrate, phosphate, and chemical oxygen demand (COD) were determined to assess the quality of water at different periods. It has been calculated based on the standard of the central environmental authority of Sri Lanka. The weighted arithmetic index method has been used to calculate the water quality index. The water quality index of the study area was recorded as good (33.60760) in 2010 and poor in 2013 (56.95663), 2016 (52.37269), and 2019 (69.04417). The study revealed that the water temperature in the canal fluctuates with the time and climate of the area. The EC of the water is registered within the reference range. However, pH, COD, DO, and ammonia are the main water parameters deviating from the reference range. It is observed that the leading causes of the deterioration of water quality are human activities, the illegal discharge of sewage and industrial wastewater, the lack of adequate sanitation facilities, and urban runoff.
Contributors
author
  • Department of Wetland, Sri Lanka Land Development Corporation, Rajagiriya, Sri Lanka
author
  • Department of Chemistry, The Open University of Sri Lanka, Nugegoda, Sri Lanka
author
  • Department of Geography, Eastern University, Vantharumoolai, Sri Lanka
  • Department of Biosciences, Universiti Teknologi Malaysia, Johor Bahru, Malaysia
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bwmeta1.element.psjd-fa7597fe-e6cb-42df-8ce8-137e4be258b8
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